PLEASE be careful with Skarner nerfs...
I've always loved Skarner, though the good and bad. It makes me happy that he's actually better now than he used to be, but I understand why he's being looked at for hotfix nerfs.
Just, please be careful. We don't want Skarner nerfed into an Impale bot again. I always used to love building damage/duelist on Skarner, and now I can again and be effective... We Skarner players don't want to lose that.
So yes, nerf him. Nerf the base damage on his E stun and add scaling, increase his mana costs so he needs to pit stop by his spires to avoid recalling. Just don't nerf him into a tank-Impale bot again.